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10-31-2014, 02:57 AM   #1
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Weird Flare K-5

On a recent trip to the mountains with some very strong sun, I noticed some weird flare from my K-5 using both my DA15 and FA31, shooting into the sun for starbursts.

Both were prob stopped down to f11 or more, only the FA31 had a filter (with 16x Hoya HMC coating) but the flare looked the same (it goes all around the sun with red/green "dots" in a square pattern). Similar to what I have seen on my cellphone sometimes.

The problem didnt appear in similar conditions a few days later (maybe the sun was weaker). My hypothesis is that it was just super strong light reflecting off the sensor.

Anyone recognize this?

The image is a big crop, the sun was in a top corner of a landscape for both. Unedited RAW

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Last edited by Deimos; 10-31-2014 at 03:03 AM.
10-31-2014, 04:29 AM   #2
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I know that one way to deliberately get that effect is by using a small aperture. Maybe that's the reason although I'd have thought smaller than F11.
10-31-2014, 07:00 AM   #3
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Somebody else posted a similar picture a few days ago (with the dots in patterns) . I will try to look for the thread (edit - no luck but I will keep checking)

Last edited by sergysergy; 10-31-2014 at 02:04 PM.
10-31-2014, 01:50 PM   #4
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that looks like the bayer filter on the sensor reflecting from the rear element back onto the sensor

Matches the pattern. a square with 2 greens, 1 red, 1 blue

Bayer filter - Wikipedia, the free encyclopedia

10-31-2014, 01:53 PM   #5
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that's pretty cool... interesting!
11-01-2014, 02:48 AM   #6
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I agree it's definately the sensor. The effect has been seen much more on the 4/3 sensors (for some reasons).
11-01-2014, 03:03 AM   #7
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When was the last time you had your sensor cleaned? How many clicks on the camera? Normally I would say it looks like your lens need to be cleaned, but since its the same for two different lenses, perhaps the problem is internal......
11-01-2014, 03:35 AM   #8
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Yeah, I think the FA lenses don't have the latest lens coatings, optimized for digital. These are still "film" lenses. And this means the sensor can ghost/reflect.
The best you can do about this is use a tight hood (remember, you can use a smaller hood than the original one, because you are using a crop camera). I also heard a high quality circular polarizer might help, but not sure.

11-01-2014, 10:40 AM   #9
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QuoteOriginally posted by Na Horuk Quote
Yeah, I think the FA lenses don't have the latest lens coatings, optimized for digital.
Did it with the DA 15 too.

I agree that this looks to be a diffraction pattern that may have its roots in a reflection from the sensor. These things happen. The rule of thumb going back to well before my time has been that when shooting into the sun, all expectations of predictable or consistent results go out the window. What you get is what you get.


Steve

Last edited by stevebrot; 11-01-2014 at 12:17 PM.
11-01-2014, 12:03 PM   #10
Zav
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My iPhone does that!
11-01-2014, 10:53 PM   #11
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Thanks for the replies. This isnt that much of a problem, well it might have kind of ruined a couple shots but no biggie. More curious if it was what I had hypothesized or some other cause. All other photos look great so I figure its just the strong sun effect directly on the sensor
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